Journal
APPLIED SURFACE SCIENCE
Volume 261, Issue -, Pages 8-13Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2012.06.099
Keywords
TiO2-nano-SiO2 hybrid photoanode; Dye-sensitized solar cells; TiCl4 post-treatment
Categories
Funding
- Major State Basic Research Development Program [2011DFA51750]
- Natural Science Foundation of Anhui Province [11040606Q45]
- Research Fund for the Doctoral Program of Higher Education of China [20110111120002, 20110111110002]
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A TiO2-nano-SiO2 hybrid film was prepared on a conductive F-doped tin oxide (FTO) substrate by depositing a mixture paste of TiO2 (P-25) and nano-sized SiO2 particles. The hybrid film was further treated by a titanium tetrachloride (TiCl4) aqueous solution with different concentrations before it was assembled as a photoanode in dye sensitized solar cells (DSSCs). We studied the performance of DSSCs by using the dye molecule of cis-bis(isothiocy-anato)-bis-(2,2'-bipyridyl-4,4'-dicarboxylato)-ruthenium(II)bis-tetrabutylammonium (N719) as sensitizer. Results suggested that the post-treatment using TiCl4 could enhance the dye adsorption. The thin TiO2 layer hydrolyzed from TiCl4 could fill gaps between nanoparticles in the composite film, leading to a better electron transport than non-treated films, and improve the light harvesting efficiency. The optimal concentration was found to be 75 mM for the post-treatment of TiO2-SiO2 hybrid film by TiCl4 solution. A photoelectron conversion efficiency of 6.39% was achieved in the back-side illuminated dye-sensitized solar cells, which is similar to 105% higher than the basic efficiency of the bare TiO2 sensitized sample. TiO2-nano-SiO2 hybrid photoanode was prepared by incorporation of nano-sized SiO2 in the TiO2 film. The introduced SiO2 as a wide band-gap material gives a significant improvement of the performance of corresponding DSSCs in terms of photocurrent densities and energy conversion efficiency. (C) 2012 Elsevier B.V. All rights reserved.
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